toascii(3) Library Functions Manual toascii(3)

toascii - convert character to ASCII

Standard C library (libc, -lc)

#include <ctype.h>
[[deprecated]] int toascii(int c);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):


        || /* glibc >= 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE

toascii() converts c to a 7-bit unsigned char value that fits into the ASCII character set, by clearing the high-order bits.

The value returned is that of the converted character.

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
toascii () Thread safety MT-Safe


SVr4, BSD, POSIX.1-2001. Obsolete in POSIX.1-2008, noting that it cannot be used portably in a localized application.

Many people will be unhappy if you use this function. This function will convert accented letters into random characters.

isascii(3), tolower(3), toupper(3)

2023-10-31 Linux man-pages 6.7